Malicious PDF — malware analysis report

Static analysis result for SHA-256 333dc1d42d022f06…

MALICIOUS

PDF

101.8 KB Created: 2021-06-29 21:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b24b0e77efb5c45213150ba9fc9643ee SHA-1: 55af54cfc4274e22f13c493d61b9938e37f69b96 SHA-256: 333dc1d42d022f064a4493f1363c27898d2dbe025347caadcb85f1cc117932da
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/4fd3ac4dc19a45a02183b6c3261d45e4/xijojesux.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796d28befd0---zekanenepob.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kgq0ekalas24365h30b0k58ac0/tazituba.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/94581ff123b85ca03ee13a93824e3bc6/622346799.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/obqm6jr4pstph8u3fe2l8m4e5u/nabafegikolazaj.pdfIn PDF document text
    • http://www.shadowrangers.live/img/files/kusibakezemekawonuwixowa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b576ab72723---julizuromaxibixu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43dbf48b46---19899615235.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/zewiduzifusijes.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/94774c8001dd3bf7954944aede7d3ecc/pulipuvitesakuzixatofetad.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a4e29957b73a252342ed7f861ff724d7/90579793494.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a686d8afa98---nizumigebovodapigolubevof.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2aea560414cb74dc4156f724c6193d1f/20143145994.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/13199546769.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/38156b94520cf5e909c27cd2260c8dd3/ruzubakekejajafot.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c28a7c75c05---zabowarifavor.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/5287591692.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160756d66d6a03---deropexiparibarito.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c2e220b71265e69aec4f75c2f0e94546/sixetevof.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/74643332341.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/df06e206b3b68f52d28430aaed3d30aa/70645937554.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbb9a734e---nefevi.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/zigajejabigafipegegifofos.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210604225906951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rainbow+class+5+lesson+2+question+answerPDF 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.

FilenameKindSourceSize
font_00_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 24208 bytes
SHA-256: 75b9113d43636890669a1134d509a14e5b0cd65c23a1cfdbbd4d89a099c25cc7
font_01_sfnt_off0001580d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580D 10992 bytes
SHA-256: 2873c0937848f599bca390e6bb1623a7ffd0d547c800648f7ed9c8065c4656ba
font_02_sfnt_off000171e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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