PDF malware analysis — malicious · f31bdb8c148816c9

MALICIOUS

PDF

114.2 KB Created: 2021-06-30 00:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: d8d6d7ed419ea6321824d9d6242150c7 SHA-1: ee268679320569149163da664e3efe9216dbb97c SHA-256: f31bdb8c148816c95e186b0e1383ad7e8d2458f9b958cd976934c3b6e54e7a60

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links on compromised CMS upload directories, likely to distribute malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading a secondary payload, potentially via a call-to-action button.

Machine Learning

Nyx PDF Classifier malicious score 0.9871

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/097bf772bc92ecfb4bdfd8e06d7aa4d6/kafabevomumukajifojaviwi.pdf In PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b94708e0750---delibiviwimazudegesunulu.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1f8b6a53ef21ea39dc6c2b2ec3f94a25/sibilukerejova.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bm2av7oqkok9632krv4rjf2img/pazunewobuxumur.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ebc83e8373d16df455ecb74e9ab81cd7/tagat.pdfIn PDF document text
- https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3182289f5437d1b40e3ead2aaa86ca94/miromexevolalugaboxogama.pdfIn PDF document text
- http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/76695088340.pdfIn PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/03f63306e3f15da8195029720f85a0b3/73948442158.pdfIn PDF document text
- http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d2928f6774b---radamarokopomoj.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dfab25fc8---82060255279.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607066fe632cd---xurifudopovalomito.pdfIn PDF document text
- http://aqbnb.com/uploadfile/file/73539687341.pdfIn PDF document text
- http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/26433415890.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/cc7tep7pq716begqnogrd92c60/sizewavegenamazegun.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6c1od6jkkvtp50nsjuntoirosc/foneguvabofelo.pdfIn PDF document text
- http://dmhu.eu/uploads/uplib/file/31137842224.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30c550ecb---voveniruzawipi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a8d2b984---rejinoxa.pdfIn PDF document text
- https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/de0770180e632f4ab827be8593a713a3/96168826313.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b27fc3c48dc9eb0ef0d5be511e442bad/66359191957.pdfIn PDF document text
- https://prosperitas.be/data/assets/file/pijozeguvewo.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e397d2e715---mufefikozasalelafu.pdfIn PDF document text
- https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abf123c4fe---kewiwasodasarezepagi.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846fff6718b---2799587663.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pubg+mobile+iso+file+for+ppssppPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000141bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141BF	10576 bytes
SHA-256: `053eeed30e3aefa694a11abd336a988ba23c7c6ce22776d6d1696862251394da`
`font_01_sfnt_off00015998.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15998	6780 bytes
SHA-256: `64b794a0eb6027e936012a6a864e89fa892fce21686ede89c3c131f65e423c7a`
`font_02_sfnt_off000171ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x171BA	18768 bytes
SHA-256: `6eef53d4c7a37233a85efc76a229982e20cdcd23f7ab44108b93957fcade35e2`
`font_03_sfnt_off0001a2e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A2E3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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