Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0a28638ff35de5…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 14:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfd59c1fdac017499ddd051e0cc7161d SHA-1: bfde4c3a3bc34dde11c667621ecad99eab835129 SHA-256: 5f0a28638ff35de59d0b25cec4eaedf2b66d7076666a9c0a75f7415e2bef595d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests an attempt to distribute malicious content or phish users through these links. While no scripts were explicitly extracted, the nature of the link farm and the 'SE_CALLBACK_LURE' heuristic point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=how+do+i+put+ringtones+on+my+phone PDF link annotation
    • https://askisan.com/upload/ckfinder/files/milaxelanefe.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/wofemuzinezogugoxilogu.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/19555070718.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3fff002b01656bc0b74acf4a8b8286ae/tinazezo.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/guxopo.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/giragotanuxifaw.pdfIn PDF document text
    • https://olterus.org/contents/files/10311578140.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/38008907717.pdfIn PDF document text
    • http://cycling-software.com/files/file/19351836979.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/98500536471.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bd051773---gixewinik.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161394d35458bd---47679851324.pdfIn PDF document text
    • https://songhong.info/userfiles/file/68106730648.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/vuxodijudewixawukerexojet.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/28069555764.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7bc74c040---gitegixotula.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/96726525801.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/guganonewusuladuzoke.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f63acf59---wifakarokimadar.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/79c371d914761b2d5d48a50892c3f12e/tupijisokadisi.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/63283687935.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/92955260941.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/safebavotenukovujij.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/vokelemusiw.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
font_00_sfnt_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 18144 bytes
SHA-256: e9714e9a6497598c8197b9b335aa4793a91634224532398b360fc4e4c8594473
font_02_sfnt_off00012abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABE 10924 bytes
SHA-256: fd002b355258b8af124b05dd82b7e74a0300003af1484d154a81425b521198e5

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