Malicious PDF — malware analysis report

Static analysis result for SHA-256 454dc1e7b14d082b…

MALICIOUS

PDF

106.6 KB Created: 2021-06-30 11:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be2a8cf7450ef6ab1e1f65f68ce5d6df SHA-1: 6c329abc4d471900ffb24c7d341c5a413678c802 SHA-256: 454dc1e7b14d082b8997ef3dd90d623b0c8a807cc49974930028e1a8c587b879
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9693

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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098fd4bcec97---mewerotiwarigonoreku.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160876fe044615---wukexinej.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080118dc5a5b---vavekezuxaga.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c3cf936eb---8688464297.pdf
    • https://mirrorlink.com/public/files/files/46133139053.pdf
    • http://www.rify.us/cms-uploads/files/91632118996.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb634bce9---76040577801.pdf
    • http://ankaser.com/userfiles/file/xezakipuzufosolikuponubi.pdf
    • https://amitadevnani.com/userfiles/file/turafafegas.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502c3227d0---sakubobise.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac3c5b445---96699421223.pdf
    • https://lingchuanfloor.com/app/webroot/userfiles/files/wajiniruzamemuxodalokotet.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/jewesugisotejapibe.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7fba07a8b---94316032814.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1e3bfa6a0fac24f08eefca6f77c6b424/54501527997.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5110e70540---57437538631.pdf
    • https://b2cexpressdemo.com/userfiles/file/sisolixixiji.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/r6ti0tm5ectfvr35tmfkjriiu9/pumobavu.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/44448418782.pdf
    • http://toyteepee.com/uploadfiles/file/210522171254793999h1230c.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa1d3e594---zadev.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f608fa3c---pobebu.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/bf89225f858d5a58c88c89983f406d0f/gebazijarojilutadojexik.pdf
    • http://medicapoland.pl/uploaded/file/nukamofipovexumabep.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b3bb583899630559fa71901adeb5da5d/kizevunolubozezizameniz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vowel+and+consonant+chart+pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/23633300708.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cb.bin
c62fe2d6bd290291ca9fd9f962e9fb4f6282a8f5c893ddd033e998f262549c5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 35192 bytes
font_01_sfnt_off0001558b.bin
448e8e28a166d3beba85e43e7ad8640d77d983ef0486ff3e7dfb09e0623b3b08
pdf-font-stream PDF embedded font (sfnt) at offset 0x1558B 10680 bytes
font_02_sfnt_off00016e0e.bin
a2926dc71737ce18c8f4dbf0959feede46b20c4f976c0f7054c28a641e43475e
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0E 16444 bytes
font_03_sfnt_off0001849f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1849F 16792 bytes