Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85636c7b32987ae…

MALICIOUS

PDF

95.8 KB Created: 2021-06-26 05:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47c9becd314c8a4d1f7572d0a6d67883 SHA-1: 2ec88d246067d861468779f52fb2bb285dec1c46 SHA-256: f85636c7b32987ae7810ee885dc3b6ccf851a76c5ed98204555f0f83f2f2ea12
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ffc53d619---wibovugo.pdf
    • http://ippinnudon.com/uploads/files/kezivak.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kbnkj2s1mc5b51io6ard3loahe/59392271841.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1b677035c---pasegexeri.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074930ea3af7---tapemotutorokexizeli.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/daedb7e354e6db7c7fc0b7bcd71bac92/bixibox.pdf
    • https://aslimitada.com/userfiles/file/61684430209.pdf
    • http://apsons.eu/files/file/53849543142.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6939178b4b---kumubepoxikoroxuzegabe.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5804cc9320db167554abe779d365c42f/moruzamufiko.pdf
    • http://abwingsbuffalo.com/uploads/files/59370253007.pdf
    • http://sahamit.net/userfiles/file/56976581979.pdf
    • https://actorconseil.com/files/file/32545801979.pdf
    • http://thermogroup.ru/uploads/files/75076257301.pdf
    • http://www.mostenpo.jp/userfiles/files/49761513058.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c748be7ea19---30111464690.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3b409388b08504f328fcb0ac77953d5d/14595455558.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a849cfc68---91723160049.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/11447393089.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcad2a3bee6---kefozadovokuj.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dba656aad---lapetuxiv.pdf
    • https://edarky.net/data/file/nopameropeletinutoxodedul.pdf
    • https://augsburger-dartliga.de/uploads/file/98455942642.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gneiss+is+an+example+of+this+type+of+rock
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa16.bin
41872f7b2dcf492460a21dfb6798bb94553c5c8b05f97942c47e2341f8e68064
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 11092 bytes
font_01_sfnt_off000113d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 16792 bytes
font_02_sfnt_off00012be8.bin
f4f715dfc740a65d24c937128a160ad266a1968da3495cdff43273a822c34366
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE8 17524 bytes
font_03_sfnt_off0001599e.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1599E 16252 bytes