PDF malware analysis — malicious · fd515d55bc7f467f

MALICIOUS

PDF

81.7 KB Created: 2021-07-05 23:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 3e3385b01e39cf5bcf60f46f18353744 SHA-1: 20b74c8e65c469f7f14c99f96144a592e676bfc5 SHA-256: fd515d55bc7f467fb8dbf9f270d769c4bf615251b40f54a509c03269bc09fe84

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories or disposable hosting. These elements, combined with ClamAV detection and ML flagging, strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://gazosilikatnn.ru/uploads/files/bavatedanarulatesigubu.pdf In PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fa3kmeoh5t6jsipopu6jb1hirh/34950994590.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd28b0edca---xemokoluxeli.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c2970a9a874e7c7ee672417ed0378527/ganolozafibogaril.pdfIn PDF document text
- https://hse.tw/upload/file/lulibat.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e29aee7d3---kowexulezuwenid.pdfIn PDF document text
- http://systemsbiology.at/uploads/assets/file/turexapolufelefutiluma.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51dd61466b---16699987622.pdfIn PDF document text
- https://sfasg.jp/js/ckfinder/userfiles/files/nafipogojeseluroteke.pdfIn PDF document text
- http://bakoca.hu/files/file/pojulubujodiwapobe.pdfIn PDF document text
- http://muzeumostrowiec.pl/obrazy/file/74630590415.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7f772ba28d0d56c3c2c0034731945b99/52297168124.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd266f90a---3843114439.pdfIn PDF document text
- http://wanyuantemple.tw/userfiles/file/xisisumibikal.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1d0c0d4e901e5444691b3a4cfa6ab252/torifonu.pdfIn PDF document text
- http://cleanyachts.it/writable/public/userfiles/file/61445511439.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e910d36ec0d0d77f43bbb07aa49f7f28/93868757227.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/t04lr68mri7fuugaqqsjau7a61/44874076866.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/34494ea7035e1ec8cf0ccbadf89798dc/86756846910.pdfIn PDF document text
- http://arcdesantmarti.com/biocop/Images/images-editor/file/visalerodekepi.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7da38c37d---45552866020.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd83945438---22022742503.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094931aad1e4---22796128455.pdfIn PDF document text
- https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/r3kk9qeg7vvciohhnfnkfcpms8/segujit.pdfIn PDF document text
- https://thefencedocumentary.com/adminfiles/file/kozujomimugudumabil.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/86f6b2c552104581b7169d155755deae/fokunezojoweja.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=combine+two+images+into+pdfPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dbb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBB4	17004 bytes
SHA-256: `e36ffa4401c9b2c6557ae1accfca784525887e7274795ab64f117b1d853605f8`
`font_01_sfnt_off0001084d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1084D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012064.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12064	10952 bytes
SHA-256: `485ccf592d18340a41b2ab5f66f8f126ef1ca195ce7d4c8d8dfa50d5a8d78240`

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