Malicious PDF — malware analysis report

Static analysis result for SHA-256 6905b5dba3c122aa…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 19:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 237ceaf1d1215bd7885bffb7c8d66f9b SHA-1: 6dc2fdfdcf3232b30f79e527c57b9a5058527447 SHA-256: 6905b5dba3c122aa9f1ef52d0a028962461626732105e05b6e07cf4a0917392c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm, with many URLs hosted on disposable or potentially compromised domains, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm nature are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://scvumaichiramen.com/uploads/files/tavimitivigasubibiles.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fjpli5flrearojtngp0g612ek4/74199331377.pdfIn PDF document text
    • http://dogable.de/userfiles/file/69038189218.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210811022205.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/pisekafurotuzofelalawene.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wotofexabujomavaxid.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/wogujobogekusama.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37e9605b4---vabikawu.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/21259027813.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/bedutaxawasuvobozojika.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882e06a37c---5432326796.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/78079359437.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/kuvozojeburunerekegowop.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/nufowemamepo.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/pusujugogisawokupezepaw.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/52356287941.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/86723673018.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/leibum5qnk61r1keiokk8s241b/18601049004.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7098e60f251fb24765805ec4833667db/586496259.pdfIn PDF document text
    • https://akemi.ro/hirek/file/sumoruxiperodomikurufiv.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/vusipezininu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a6f9d0667---19356432037.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/fofosiwudebur.pdfIn PDF document text
    • http://rochesteradams75.com/clients/7/77/774a1ed2e17b5a3c8fe4214cc08eab78/File/60451401300.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/53000502953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=production+budget+questions+and+answers+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_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 17424 bytes
SHA-256: a6cd0327b09b62b76bbf0e8a4cf9a7a1ab33db8cfce7cf39f2872cf2f8d370a6
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 11224 bytes
SHA-256: 7bd613dac1ee10f0940dc7de604491f2114df31ab857de73ee3f2b3765abe1e6

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