Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fb6291c14e7575…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 05:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e2877c84071b9f5949a0f0f581a1b4f SHA-1: 7f094aafa43369acdef17b12c7731f003e28b4ee SHA-256: 41fb6291c14e7575c32f4ce15915a7be584e90791512998f7225d36710698341
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a link farm on compromised CMS uploads further supports this, as it is a common technique for hosting malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kasargod.net/uploads/file/fawotalotusexivozep.pdf In PDF document text
    • http://studioguidobarbieri.it/userfiles/files/tojuzedelofilanaf.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/95pck6jovlihqau3ret6tibmuq/xifezedexuzunimixaweb.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/gapidejebamomoxuri.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/9163341139.pdfIn PDF document text
    • http://biosite.ru/images/news/file/tokeremil.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/xizuvevibogafeje.pdfIn PDF document text
    • http://chemicalengineers.ie/images/vapodozu.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/63969810121.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/62000236680.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/lgr6dlqqt6kog4ssgu8dne73l6/fijojibunexojujawuti.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/punaxizo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/govewupix.pdfIn PDF document text
    • http://skupka54.ru/upload/m/95792820588.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/gopejowezetosu.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/32800337931.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210521185032_u0gez0.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd069366914---jojuvefobomupefasimowumu.pdfIn PDF document text
    • http://ausafe.net/images/art/files/76218922280.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/23857217324.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/xobenamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AF+%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D9%87+elcomsoft+advanced+pdf+password+recoveryPDF 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_off0000ba33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA33 20224 bytes
SHA-256: 843842ecc55e86dcefa2efda09869a180e2052d014658f6955f57db2e6b48cab
font_01_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 10860 bytes
SHA-256: 924e0b00d2c838c29da7acde28bac6129c69e5646a4cfacc08b544dadd5f0bbe
font_02_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 16920 bytes
SHA-256: b3c462f70becf758b74790427ce88f98d309c5d3d9f6c04c47214bd3253e6206
font_03_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 17720 bytes
SHA-256: fade7664e18513ff5967dcfcfa16effd9c658658b48dced2aa79b5a9f92cc8f9

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