Malicious PDF — malware analysis report

Static analysis result for SHA-256 34847977c6d89264…

MALICIOUS

PDF

84.2 KB Created: 2021-07-27 03:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a935d1b6fe57abd81c524638f4122629 SHA-1: 3ed27e93fba638a39bbdc77f83d282b8d50d7cfb SHA-256: 34847977c6d892646fa7b20fe63a8a011c467c29c14601c672ed35ace8ece063
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a likely phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or further stages of an attack. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ergo-logo-bamberg.de/userfiles/file/saroborulefomojojabu.pdf
    • https://corpusbg.com/files/fck/file/zilepufitaxemewefupinusu.pdf
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/zazimatemelowalotebamudab.pdf
    • http://imssp.by/data/images/fxeditor/file/zijobaro.pdf
    • http://kaies.cn/upfiles/file/13030340686.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba82ae886---78128115721.pdf
    • http://garderoba.sk/images/_file/fujemulap.pdf
    • https://kund-in.com/userfiles/file/58131701364.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9e07a478b6cfb584830610e0008a0472/dujuxazu.pdf
    • https://ap-qatar.com/userfiles/files/pevadilapopipexujo.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a035af61001145dff1d307bde7916e89/pazukavelagopapelul.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d7a920701362220f2956bbb5cbe3a4da/50425997623.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d95668954---pafido.pdf
    • http://istvietnam.com/rich_editor/file/37351268304.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d772a9a0c---jelageteki.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/e204576da0b3611c0670a28c5a296e03/1861151228.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9d152391552a3ea57bb084acc033417c/20609484883.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b441e715d77---rotefitabi.pdf
    • http://beamstraffic.ae/amb/userfiles/file/jajop.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/abg3kvjb9br6q56ur4chpfhm92/44111794352.pdf
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/16899533538.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210604_DFDCF14775FE29D7.pdf
    • http://aqbnb.com/uploadfile/file/84475052529.pdf
    • http://dansecyr.ca/pdf/file/xokobigunipejita.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160754ffc03cdb---burololuluz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=army+apft+score+chart
    • 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_off0000e747.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 16792 bytes
font_01_sfnt_off0000ff5e.bin
7257a4db65e3ed94b7cc1e5db3df35758c914544e1b18776a4ef3362c92dc58c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 10596 bytes
font_02_sfnt_off000117aa.bin
b87c53289a1ab195a088cdce6675c150ef1761c398b961618c67a2786ed6ac19
pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 16756 bytes