Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8a2f7ec123cd14…

MALICIOUS

PDF

97.4 KB Created: 2021-08-07 09:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9d9eb5f6c7c93d3ebcb51e2518d5686 SHA-1: 400db160146f37f74402ced2e29e62aecfe34862 SHA-256: 4e8a2f7ec123cd14959c04fb915938c84423d284f9e97b308e937d25ee734553
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, likely serving as a lure for phishing or malware delivery. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608494289e0c1---volajaru.pdf In PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/259ce431668404e45606881e2fe6e326/65941270617.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f1b42e2b032307a8fef154748b618e68/jerapuzab.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fimofonuserogipiz.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/50723057194.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7d580d2d499652d831eab5abc6572a26/bogegidupi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07f979ef5230e3eff85ae2edb0d804dd/50396438834.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafbe7eac1a---nekuvomasevubulelifusu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7a2cc306---pufuwobeleteg.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nifezudejozufevapi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lok3rugfahhchr7fe9ikadmjil/62866819227.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/1120844954.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f46fe19552312dae3961459f05bcf656/tolusufikuxiwotedoxasod.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/bepewigamoturetelodoju.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c153af0b5e9---sinifipiwomugenav.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/fejemadebutomenamirenurad.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ad58bdde5bd886d90637e273af340e5c/74483794621.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecadfc7139---80844768034.pdfIn PDF document text
    • https://hocngoaingu123.com/upload/files/xidumavitizo.pdfIn PDF document text
    • https://okazionche.com/files/34163329938.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/3565843259.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/miwumagonoxogog.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4d044cf87491d3f7fa4a9413e42f67d7/76352001214.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f8000e7789012be611adca382c4a0e75/89945381630.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb79085e19---gelakujebopixamemuzub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+wolf+chinese+drama+episode+41+recapPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 17004 bytes
SHA-256: 1682c3c5d0abe1e4eedae661add9001c3136f30165f760631b58d10a26de2329
font_01_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 10968 bytes
SHA-256: 7280c8128c9fd86b71561e02f2742938086a77c697914b905257991493533fae
font_02_sfnt_off00013a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001526a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526A 3256 bytes
SHA-256: 1ac3ac46b348d6faecd382d0a0369598862e57ea31103601aefdf539ea953fbc
font_04_sfnt_off00015f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F89 16624 bytes
SHA-256: 68df5b3e8623f5a752d1e03a83cfa38f53bfd9d917782ba1580497d1a2fd4864

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