Malicious PDF — malware analysis report

Static analysis result for SHA-256 af35d0d648924963…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 17:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39017ec8bd014b123418a385c05ba14d SHA-1: 78cb2c0a5fb54c9f8b614e829981b7c59454da5a SHA-256: af35d0d6489249635344d69352cd345afaf0c5f9794a0088d289b252f8947a2e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=generate+barcode+android
    • https://franchisefarm.franchiseharbor.com/files/files/27612107477.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/38ea77cd25a324c7d4b939147882b362/lovipepaxewagesipopijo.pdf
    • http://sxcec.org/userfiles/file/zilikiki.pdf
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906231252603142.pdf
    • https://penal-garazh.ru/files/tikevewageto.pdf
    • https://tranhtreo.com/images/ckeditor/files/fikigulazupibigatamibaj.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147071255e6f---pujaxodesogobew.pdf
    • http://salt17.com/userfiles/files/wifalazijuramaje.pdf
    • http://fthyhs.com/resource/docContentImg/file/2021-09-12/33ca8452dcc8ead3d5832ded218953c4.pdf
    • http://recuva.kr/upload/fck_img/1630787803/file/lupabetazegetigekev.pdf
    • http://makassitools.com/userfiles/file///61668471485.pdf
    • http://chornakorn-packing.com/ckfinder/userfiles/files/43499228643.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/porivesidajuguwo.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210918_A56B548FB2D4392E.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/zinowadeseloxaweba.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e79dac5237c6dc9ba4a1eeaeec696ca5/wudilakajunofaratakixuwa.pdf
    • http://mariekevanvlierden.nl/survey/userfiles/files/82923876441.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10595522047.pdf
    • http://binhchuachay.info/Images_upload/files/21793701542.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1329ae0744f02d7bc3ea5005a6f0c4e7/lefowuxi.pdf
    • http://aj-freight.com/ckfinder/userfiles/files/wozepajuxo.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/fanitijetegoranu.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/dikediziwikimikegali.pdf
    • http://yhbinternational.com/userfiles/file/rokala.pdf
    • http://chinahongji.com/d/files/53587072977.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce5e.bin
3307b626684e5c6f32cb8fb59e101ec4e7c8a1e66f5b3fded7df63e58cf616fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 10328 bytes
font_01_sfnt_off0000e5c6.bin
39e095b46ca90d40a97c29182e93c207213cacaa1bc9df1aac618bc3d28b6fe4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 17548 bytes
font_02_sfnt_off0001137f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 16792 bytes