Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e89483d79ddbfd…

MALICIOUS

PDF

85.2 KB Created: 2021-07-25 19:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f82d008d47a487c8d85942211819b2e SHA-1: 657093af4416d67296df2b573a558ed30f07ca14 SHA-256: 35e89483d79ddbfd99137dded60452eb2a34f48dab5e2e0a2346d78a980f136c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of multiple distinct hosts and links suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/37624030ddba73d28e2a85bd736b0dc4/maparotuwo.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/g0064p0igchggfmkcf2lvq73g4/6523407870.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/65004308992.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b5d70c51f6414cd21ee4298836964992/luvopakusoje.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7249c6efcfaf4063940045a91e389046/42038343078.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3ffb1866---37795418246.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607771f0a27bb---ginadoreweju.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/70752411088.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f2c7a3b145275ded24f74bdbff448b1/12869260315.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c46f5e6e0f5c68978f1005958fd2807d/baguzibememo.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/fomuloni.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/wezamitul.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/33264829079.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/kovijigebogegipakugo.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/20618233825.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/87eo3npe72tck5u57531dkkp43/jajivanesimamoza.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079163fa33de---tatunupojukesepogox.pdfIn PDF document text
    • https://argumentua.com/i/file/rumibavo.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/617c51f2e21a8c4fe7eb899208892efa/dagefagorabizabibe.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/66cia5rrah24n1ooeqj350rj6b/lefamebapewamofugirin.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1tvafjpdaari7kkpf1d4lgkd7p/52187840969.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/573bb6dc910c26610d9f1fa37c6dbb94/zimubezazonekutopew.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/fixefebosozazujopam.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/midin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+free+tiktok+fans+without+having+to+download+appsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 17808 bytes
SHA-256: 1ce88a61ac5f85cf45e46ff85adea116575c971164ec8fc133978194d3cddc54
font_02_sfnt_off00011689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 16356 bytes
SHA-256: 32a61d067d170ef84ee3f83ad1ba2cadc23e725b0df5007dab6ea629016899fd
font_03_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 11112 bytes
SHA-256: b940cdcfdf2c8234d33e914d44dc81f6f3fa83be1302d1faa7851b512e58b704

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