Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44bb929acd4be73…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 17:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7ad4f556a92d377df5089b75a5cc910 SHA-1: ba6bd3769e52f5b1118b539b1e82f5cfe9cd030d SHA-256: b44bb929acd4be73e548d2593034cf4aef53ed940d614fb5793e7af20e3a7c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://alshaabcoop.com/userfiles/file/74722079288.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b1aed26fae0a1ffddc0f7159710e0943/ximofikuvezibixamuvap.pdf
    • http://nuestratierrapremios.com/campannas/file/28671843493.pdf
    • https://napraforgohotel.hu/upload/file/norajuzofowegixi.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/81770d8678d5e67b3547b689e8ea60a5/16148373790.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b04c429aa---mofufegikes.pdf
    • https://hasekei.jp/userfiles/file/ladinesedijotututusagebo.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/82nfh1ldlkdtt6ea6f2v8s7ivk/gulewilomuw.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e31bea12cb835098f4a5ccf80931207f/zugogibunejuzojilimis.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/15656187859.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/07cf10e67ffda4ac7b880483ad9f62b4/42132739169.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9631a08b1---jozokog.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5e1f184c---18354058518.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/32de681789855f7dd4b7ae26b8899b0c/79675458634.pdf
    • https://perfecthospital.net/FCKeditor/file/putopa.pdf
    • https://creteservices.com/FCKeditor/userimages/file/wozaba.pdf
    • http://efuturesthai.com/uploads/files/12698146323.pdf
    • http://whkmradio.com/userfiles/file/nazur.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/85pog5cj3akaljgh549a0sta1i/kuzevopezufaduwe.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4rq8he7pbmp162llajfbeknfc1/gopimawomisimevotubileg.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb706262dc---jofaxobisirunowubezo.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a1p3a1a231qpllda61e8rn2gv9/91580271839.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/kj03irgrt98uo6ooe0gulq6n9a/58233517324.pdf
    • http://pastoret.it/userfiles/files/45050505154.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=birds+of+a+feather+full+saying
    • 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_off0000ebc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 16792 bytes
font_01_sfnt_off000103da.bin
77a0213b5cfb853ffcf6cb73dcd7af4c6345923196cab14f4c0b33b4657d058d
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 10900 bytes
font_02_sfnt_off00011cd4.bin
bb0e07ade7ed7586e6682dc83b7924f0afdce152d107f9a4f22ca984423fdc62
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 17032 bytes