Malicious PDF — malware analysis report

Static analysis result for SHA-256 370678df32fa794b…

MALICIOUS

PDF

90.3 KB Created: 2021-07-14 07:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79311844117bc75a05e79aa581638bdf SHA-1: 742d8af24b3a43db3b497b367d5a0516759ada82 SHA-256: 370678df32fa794bc15a51fee7f6cf6d4fcdbb96928d83bb7562c7f0dfa9a942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=how+many+numbers+are+there+from+700+to+950+which+are+neither+divisible+by+3+nor+by+7 PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87a1acf71---98823746031.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/47393238351.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ce058803---92315072006.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/57031761366.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/zamovebo.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/78775091083.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zoraviraxuto.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/72348838986.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3833bcfbef6a098a6224842020c31fdb/vatawilopamajefof.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2ec8c1d520faccfd7bc8958d4111b088/mobilageledujonazipi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ffb8249b3d54f04c2488ecdc3125eb3e/33388710849.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/mufetanivumop.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/35746223056.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/xigunidaxipizatetar.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cbd9397d809adf3e677f9cbbdcd5d61e/bujapanuninelikogajiredoj.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d7db328d9e64815834159e728c5ba3c0/55073026470.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/62394850595.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719ada786bc---jerixixikirokuvogake.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/48f0e17d46d70b2eaad1051cc60600e1/ginedikuwegadukek.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fufikigufiwubezij.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b534b13b1---rubafe.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0b5db15e---17781501810.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/49bcd057ecaf3e642c13439c67b9c461/90583682727.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c36cb77c6aed98c9ccc1e4d07f7f1a83/guburew.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f180731dfa---jujixenuzixivudena.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 16500 bytes
SHA-256: 2263307aa5c545335aacf6f88da5528ea2da9f3144b2cab4687b1bf58ade9252
font_01_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 2140 bytes
SHA-256: d6112922a488fbaf08581fef8ed525075d1b74c45477030cdc5e87ed80e3f9eb
font_02_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 11884 bytes
SHA-256: beed746d8a38d2967bd0b69dedab5ae5a8d494218cf9e555322211c901e2177d
font_04_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 18448 bytes
SHA-256: cb1b8e19834b3cee7079fb1ce346ac7ce5f1591939bc0d79711a469d432f67cb

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