Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f2fbbb657768e4…

MALICIOUS

PDF

87.3 KB Created: 2021-06-25 16:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71c1364c882d289b6446573eb776e44f SHA-1: 6bce7a4960402f86f7a8fdf120fc5283f2a879a8 SHA-256: 82f2fbbb657768e44832f5dc70a7872a4a7d863852c35bcdbdcb19189361a1d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/be1785ef41bc751b6b741835296e1de3/96961573549.pdf
    • http://alhouti.com/userfiles/file/5995127982.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089e81ea5323---83377800435.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ea7473bd757092677521879214dbfb4b/vudukulusivopurutumuvev.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/30cb0ba5bd7b75b113072450cf1e41e4/60098042761.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lengfju0ur6glg83m9cds16ii0/fupudifanozemimog.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21376191dc---79081934597.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/nukozewovusevegot.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/gn55qqrcmaidldu7ffkrpmd43t/maferonadowizig.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/68a0539a1bee391c66e966f312a3ea44/37269185366.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbd7267de---82286742528.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703909b1790---72418185569.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3875d85463---pojipunepugefun.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608401ad21527---mulikulufilij.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/pdm9l7uk78pcnp0bhs5j8gfj53/fejikumif.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0usmeiva660he1vs2nunqqc8ht/89969529571.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070689eaf81b---lorolonuwesiremufepida.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=yearbook+divider+page+ideas
    • 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_off0000f0ef.bin
a444c3e208912e61ec9928178829f5d4f2d64c6fcbbcf2895e7d9bfb58ba7fe7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 17680 bytes
font_01_sfnt_off00011f13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 16792 bytes
font_02_sfnt_off0001372a.bin
413b758ee43679318482b5581397bc9a3ceaacb6a0ca70c67c258060a2a0c0f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 10600 bytes