Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e301685ee2a377…

MALICIOUS

PDF

87.2 KB Created: 2021-08-10 13:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9cbf1c659ee38cf00af32c0fc1b9e95b SHA-1: d0573be1cef1bc442e0018125e34301d0b831bdc SHA-256: 88e301685ee2a377706618593ac2b56f566ee51f2f816c24c34d48ed3baf93d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest a lure to download manuals, likely a pretext for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb340022867---95195845209.pdf In PDF document text
    • https://aromamarketing.md/img/files/32200619028.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f1f08c7b2d82e59e8271b524385c487/78774876809.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/abcb317375b43c08a0cc2cc90bb59a4d/41877896110.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/vezabojalerukenamabemujo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e53c8965534dd52c2d38ca43ad731795/32881195861.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/48085351852.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/gawutosadadixa.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/21696006533.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/7201536543.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/pubemukimozoz.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/penutoja.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/32152369758.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/49691907832.pdfIn PDF document text
    • http://short-story.ru/upload/file/87983896042.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/81177086308.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608258f2a36ae---92097516175.pdfIn PDF document text
    • https://datawire.gr/files/files/wakiwupotovowokafilufivir.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/vuwefivaj.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/10443123248.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/fee54cd4b33dec4d3114e8f7d3b525ba/10013728983.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/1adeb654f10462ff108f4692a563aa06/74466428633.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc218338dd---towegikulabubufixav.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210509031744_495031648.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/41503272343.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1c1a8dd397b2156d29cdc8150b4dcee4/regosoxuxuzisunedokamepo.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/sularexixijunemefuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2019+bmw+4+series+convertible+owners+manual+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a254d49f43d8e9695b56cd23ad46c0c1/jetavatofusu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 11616 bytes
SHA-256: f8798f030e42ceceaa274bf2ab0efb53eb480ef594de7f67c7b5cea9267789e1
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 18544 bytes
SHA-256: 4b664d51451c02679c9c82658d9a84640d65ce16361a2420ecff763d31d8a442