Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d3a783ec1e644c…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 03:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d95d3454b152ec77dc1014b6f0201293 SHA-1: 2b1fe707b216171bd9950a777e398c292ac138fb SHA-256: 79d3a783ec1e644c4bb8358ca0a6fa5231545c95de4d6f8e0cfda1b46d5ee5d1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lead users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The document's structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://queure.ru/uplcv?utm_term=cold+calling+tips+2020 PDF link annotation
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/97668803660.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504044442160297.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/30350136937.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05795c573---fomajalo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b163baea0c8---90743647971.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/769fec416aa95fcf6188dbe91bc83b42/zakebajoderujufe.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/balevabazupogala.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/bddef551885a5721bb619c9df7759e78/93683482925.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798ff6ad2b5---kolamuporopogiporavapej.pdfIn PDF document text
    • http://simonide.org/userfiles/file/61180083657.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kl7jt923d595db8upfm27s2bd0/37486893499.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirosutakuzodulozabeva.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/62917907120.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/minemiwowejon.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/wopepatawo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/18bddc3cfa039d07cae84c707addfd6d/16329521752.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa4e92ac0---situfifuwajevigomuj.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/regixiniw.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/pirapopipudafoxudo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607540f2076c8---mimaluju.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac26419598f3123e04a1b822abb447cc/58999151021.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e1753a290---viterovenosemuwufowu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0194864e---96415926955.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4467fa31413b2b7b4d82f9abe9f244d8/15022519949.pdfIn PDF document text
    • 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
stream_004_off00013487.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13487 10732 bytes
SHA-256: 1cc35ac0656d296ccd31c65a60c50a4822bf3c625631a165422b140eb6f70712
font_00_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 17012 bytes
SHA-256: c76650706cd9ec1f42e13867a3717089bc6e777963602d68d4a1bca26776af22
font_01_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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