Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83161ea131f6c86…

MALICIOUS

PDF

90.1 KB Created: 2021-07-20 09:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d795728c142cb050ea72c1dbfd5a1dfd SHA-1: 74370b5043374019e32ad4991172d09889896d33 SHA-256: a83161ea131f6c8687af2d5cc023cf3e11f440b436a7a703118539fd0f95307d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and embedded links suggest it is used to distribute malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090c52edfd9f---51372572335.pdf
    • https://tonwen.org/userfiles/file/42548906133.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a401a784465---logifujoxufiwubetufekitet.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d32445b4354---bubiwekexave.pdf
    • http://hzqzg.com/d/files/60106209257.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429053626963686.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d6a49f08---xarinerofakagulawopogov.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07996ec8d6---99875809036.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d680ad1f092---87722956555.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6e0d2e346e425db24d2ec44c68e6e3df/8311274247.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/nvi27dd60k5f8lraqcjis13015/suxopave.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80e6a7254---45858492836.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b68f654fc---kitedejorawedoritigitus.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/275l9ieqe81c4a65omeua5nfd2/60965088163.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bd0t10o4ktt816udotsllid2lp/remegufivid.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e35d76e9ef6---tenurapotozifibubujefopak.pdf
    • https://sasalidayanisma.org/uploads/file/robutomalavon.pdf
    • http://seoulsquare.com/userfiles/file/74701620042.pdf
    • https://immobiliaresancarlotrieste.it/file/17893694720.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc21c1f34---87719657050.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607840101751c---2481135032.pdf
    • http://appletechsolutions.com/userfiles/file/61682129048.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/78091367544.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+slime+without+borax+and+food+coloring
    • 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_off0000f857.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 16792 bytes
font_01_sfnt_off0001106e.bin
261d9245546e5e8d8b683d5ec445e02e81dba8c6d9faf86cfdd5bb8dae08dd07
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 11432 bytes
font_02_sfnt_off00012b12.bin
d63e8c5ea0e14b757a6e33dafa794c603d6dc7cc182c52114e7005b2f40bb262
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 17472 bytes