Malicious PDF — malware analysis report

Static analysis result for SHA-256 58932bb273581c60…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 04:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d743f1fbcb46840fec96dd8b2dce61e6 SHA-1: 2402a5a65972aab5ee33152b8b62c0c75b7147c2 SHA-256: 58932bb273581c60610189abd6d1876a87cca3cf5d7dd35f97d973793a8dcd46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://leaders-adv.net/userfiles/file/37298387124.pdf In PDF document text
    • http://poltinka.ru/userfiles/file/83020688830.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/tulilurinamadirotasevu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cbde8c68c---11280663901.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/81446021835.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/lemudasufixavere.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/smtnov367lm6c1e3uftegjskl4/murapuj.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/64844628264.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb46b24ac---woratugorapure.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/31199730479.pdfIn PDF document text
    • http://grandfiltr.com/files/file/tisepur.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/vunevarevazumolava.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612903a42a9a1---wenoganasamut.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e97716e50---22014326275.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeee27d66b---vivujo.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/95593965334.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4da5eace4f9040e2fd84b4bd88b02721/5276374454.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/powuxuxiwuwimi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/82715854367.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/si4gsl82injfvt8uhm9fcdlpor/69567274280.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/54401855957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=morning+routine+template+pdfPDF 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_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 10764 bytes
SHA-256: 7582a713218885c35b3f0dfb53bbe94b51e84e165994fd684495026de0be459f
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 18136 bytes
SHA-256: fac81124adbf4e8f57fb6f075d6694c8f5aa4d67a8908bfd22c0fbf787189588

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