Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10ca91f667279de…

MALICIOUS

PDF

100.9 KB Created: 2021-06-30 10:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d41eb4640812f26089181ab745ad5c61 SHA-1: 0f3e36fc334b71db2a74ff1a75cd3cc6793511c6 SHA-256: d10ca91f667279dee8723b48c9de481e2385c78c468664c5bec573c01d6cf8a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing links across numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external resources, potentially for phishing or malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://garglob.ru/uplcv?utm_term=coc+th10+upgrade+base+link PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54a8bdf89---valalasila.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/7017859356.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a018eefe6---notamin.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160965189a089f---kerigadokifamuzowunuw.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/46696067320.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/wuwetitedote.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6ae747150a52cb44ad45f4d7dbca35ee/bemukerezopisulum.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/12206e103c6747f78dcb1fa7d9c4b79f/pusuzarepolatedeses.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/9c979a2c76e5ed6a44f34f56dbd62b2b/82270947516.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609699ae6bf5e---41724733955.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zetajivuvifitegoramanab.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///vadesuxu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a432eb8e81e---72917040285.pdfIn PDF document text
    • http://siembra.me/uploads/files/98379192665.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/79330552010.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h009ikrshm006upskd2at5lqk6/10168171997.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739fc8b39be---68316821781.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de59318c38---waduxegujafomupida.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe47386be7---75154514485.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/24296147504.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rurole.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ce590038---42633967962.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607126283b549---12194095032.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa32fef989---77564151317.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/22927741009.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 16084 bytes
SHA-256: d11bfa2b02c462a3f9075532ce7ec1132ca3691ccd6a850e0dcf0119a218c04c
font_01_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 17284 bytes
SHA-256: 507cc05d50f2c4b2ada4c941b862dd95b7a45cc4207abe9f30ed24b1dce01deb
font_02_sfnt_off000153c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE0 11332 bytes
SHA-256: 7b2061e6b8b8a2548ab6132cc421555766769d9ec8be1122debd3a58487808fa

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