Malicious PDF — malware analysis report

Static analysis result for SHA-256 003c68fefeb9b778…

MALICIOUS

PDF

122.4 KB Created: 2021-08-07 18:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8f77527d973837ce1733c801daaad240 SHA-1: 6b3a04a297e5364dd1fb2fe5949633c7cfff1d70 SHA-256: 003c68fefeb9b778be2f03566225b36c0b1d55c6e158cdf057b94cda47e252ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or downloads. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly indicate an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lee6q1ju2loufn8sejbktneskn/28453320121.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd19f45cad---14388824566.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/84968456762.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a3752dc8b---24190946784.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f18c16c7a---lilonezilogadatexa.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-18/20210618003658371929.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/jexisetilomejitiwomutado.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc4cccdf8---dukagaxigojesozipix.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/vabal.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/siserewuki.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/nifisabakemo.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608761f583aa6---gulufibuveruzuk.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6ca0b7942f3d49411bd2e75505564229/gofife.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/18aa1cc2a8ce553e6500490e5def8a55/66848396459.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82c01b94c5---lusesunokasejatuzel.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c71ad1642d6d2f98d4340c362b98def2/zozepadogipuladizufo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5d632bf79cb73feabe6ef8226092ed54/98525119871.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1061e69f45ff760d8fd901f418809d3f/38813622499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=communicative+competence+definition+by+authorsPDF 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
stream_008_off0001bcc0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BCC0 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off00014729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14729 11288 bytes
SHA-256: 7753d2aa91492296d9aa9ceb4e0f825e75723e9bdcbf64bb68591b33cfa6e7de
font_01_sfnt_off00016156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16156 22068 bytes
SHA-256: 46d9c095e5a0961e49c3ad31e946f6579eb823552b2dbad2446f1f0f9ce1ddf5
font_02_sfnt_off00019730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19730 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off0001a4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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