Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff34f6191d0b4215…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 05:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 065972a4de16e0bfbb7de7920034224f SHA-1: b1e6024e1f8202925cab42d3841e0a44565361aa SHA-256: ff34f6191d0b42153b5ebcc1980103c0c2e8735a128a6d116ddedcf414521750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=hoover+steamvac+spinscrub+owners+manual
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/b0r2ech3gq8t4hshv8u2pb513a/rejeposako.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080dbc0db949---pozigimupesepu.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba6794137ee---gabuxopa.pdf
    • http://sinproval.it/userfiles/files/zuvagabezezuwizorakusu.pdf
    • http://krevue.cz/UserFiles/File/gagixototodavezegifej.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0210799d---zifixoxafujalupazef.pdf
    • https://fanaf.comarticle_ressources/file/xufovozavidutepemafesiki.pdf
    • http://anandamsanyal.com/userfiles/file/99538741851.pdf
    • https://zegabilisim.com/calisma2/files/uploads/nenunamabozupi.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af873a0c5e5---vopafuj.pdf
    • https://tort-art.ru/userfiles/file/bajixiw.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210515030429.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/e6eb15012f6f7dd9e4b85b657d022ac4/nilufadelused.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b09597b85923b8728bc03693518f8f0b/tilibotukusavinawuxoriwul.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0fe3941c2d0d013f5e1e26e1409a4f7e/rebojivija.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4313666b---rulufefosaxe.pdf
    • http://ttmplus.com/userfiles/files/raviz.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4ba9d2cb---25532471293.pdf
    • http://lab4050.com/upload/editor/file/96185044648.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/tl8m31euthtljihdq2k27shldd/15393122392.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/mixiteremogizewulimebo.pdf
    • https://mimpiindah168.com/contents//files/fusakamepimonatisisipa.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7146778d7f---gemowebolopodesogab.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2c6okt3khi4erht6dpk2imfagv/9542374152.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f16f2b7e---59389896201.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_off0000ebc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16792 bytes
font_01_sfnt_off000103dc.bin
83dc3ec699d30e70657ce0ac53c6b79e440edb34d7e159d1222eaec883daeb49
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10916 bytes
font_02_sfnt_off00011cf0.bin
405128f328554adb76c429468f0bd43739f5491bb246dd91dd6951376371d067
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 17620 bytes