Malicious PDF — malware analysis report

Static analysis result for SHA-256 a461a996758eaa1e…

MALICIOUS

PDF

75.4 KB Created: 2021-08-09 08:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ee340c1ccf1cc67d4bc42b588a868f6 SHA-1: 56abdc617f0ceff429a384ef5539e2e63503b479 SHA-256: a461a996758eaa1e4699d6aa3cbaf201fd809658eb077c03917995d430d19599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://garglob.ru/uplcv?utm_term=diary+of+a+wimpy+kid+the+last+straw+audiobook+free+download PDF link annotation
    • http://brandnewgoods.net/userfiles/file/zamabidegoworurebupal.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/jenulusuvojegumez.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/pofafufixamimaponokufew.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/53790999203.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/8251860048.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/47880259753.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/letivifefesejij.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6tt9dosk5u72a5lmkbafvkmgv7/81484607594.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/jevakutasapudixami.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082180ee698c---26205249970.pdfIn PDF document text
    • http://quaint-house.com/60498270044.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c4c69e195---lekenexegijorokafido.pdfIn PDF document text
    • http://kasargod.net/uploads/file/30027871149.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/fikazatu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaea80253---35088935159.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/7569628171.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/wufut.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89d2ff6ff0bc17ed20fc9c8af2108b0c/gorujagusudixateme.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/gafopov.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/jixivusamukot.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03d1f98b4b---90541767284.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430063307998896.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_off0000c09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09D 11296 bytes
SHA-256: a74ff33452c76fa93c779d269a96726542492792cbb4fb17326ef58378590348
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 16916 bytes
SHA-256: a0e18777ceb23d691af6d6e3eed95e87879c785115003c120eced512ecc40b06
font_02_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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