Malicious PDF — malware analysis report

Static analysis result for SHA-256 b680b61887e5a364…

MALICIOUS

PDF

269.0 KB Created: 2021-06-30 20:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: edc3890ee1ea7cb395bc1ee6c1ccf317 SHA-1: 2eb1e2dc41cb7dfd868d3739b4c36e11e6a04952 SHA-256: b680b61887e5a364c053d25e0583cca8d73f7e748af791726bb26f79bd7ceb87
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains multiple links pointing to compromised WordPress upload directories and SEO redirectors, suggesting a phishing campaign aimed at financial fraud. The document body, though heavily obfuscated, contains language indicating urgency, further supporting a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c30886dce31---davosuzisuwuderorivu.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b2ee8df---5239442932.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/747437974.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/turapevetawomerotesuxe.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090908cd8841---34245109629.pdfIn PDF document text
    • https://digireg.cn/upload/logipufulibipona.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/irnujglgp8q2nvp2ketmmv7str/nugutejaxixumaxiwuxadozi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfab17455ae---vamobolodejinabetuxixi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe0fe0eae---84015464295.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c843f5f2---gilas.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/lukexevabaluxusasupometok.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/reborosagegoxafe.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/623fb4ec694cc48d3153ad4791601a76/3487067075.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/6d7b53628afcd853d8eacf2ca56fc9d9/kufinibizepafokepefo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/796a77e1867caa8e1983b1db5d61c626/33538350578.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/54kufs5fmu94m8mhk811vqvck1/49346731187.pdfIn PDF document text
    • http://allasclub.com/campannas/file/tepagejok.pdfIn PDF document text
    • https://cape-electronics.com/media/file/92462642916.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dc6jcp32en2s384tj243d8mcrd/bikodopewob.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609258a0c7b3e---pupuwosotixu.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/97568502741.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/73303210392.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/jatakatebitatifatijopuvif.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/rojogedesitafarugamuluxap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=merge+dragons+summer+eventPDF 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_off0003c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DBBF 10612 bytes
SHA-256: cdecad8abc4ea4c8d58afb49ec7b52db286c4e6d5d11e48a2fe7489ee244199d
font_02_sfnt_off0003f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F3D3 18904 bytes
SHA-256: a735bd580a84281a10e13450a8cd4f6d082f0f07a1ed1e1713783250bf3a6cc3