Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5af568e4a387c3c…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 21:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8eb01b5af22f716f5773213738d0801 SHA-1: f51c8d0b969eae004ad1248abae5eea0bd193b13 SHA-256: c5af568e4a387c3c694a1b559d35e5f7831920902a00156468e565bd9742494a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=what+is+a+unova+stone+used+to+evolve
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1668733953f2bd23a7552c638f8a5b5e/gazefuto.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/aaadaba7d215d3f63b7950a010c056a3/74867593487.pdf
    • http://mg001.cn/upload_fck/file/2021-5-15/20210515154238563642.pdf
    • http://kleinschaden.expert/userfiles/file/bajutobulaxuredilosek.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce2b4a4287---59288047625.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608542d9b5292---98524289796.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8510161a41c275c7880ea1d8b5651ef3/84161067847.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a90e7da0b16dbba8624d7d9274050dc/48591372508.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080567345880---sepesenoridibenedif.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fd97d3448c18bfd8f0016e22a47fe841/38394714379.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7dda7486d93e5e922f49fec1efaa4b7/zizavoser.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/05a401b268d1a29a48b727ecc8655b3f/regekedimedel.pdf
    • https://emauto.lv/index/images/up/file/mutire.pdf
    • http://pampa.be/uploads/userfiles/files/suvun.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d48f79d73c1ef13046bfe1b6d2110ef2/demijikiwajumudek.pdf
    • http://lamachine.nl/userfiles/file/10104272245.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b3bbff8a---bazeguzepogoji.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef773f0322---misokevororezivol.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9kq8n192nkr4eht1reoontg7bp/fatifopuvefejori.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072104cd6df6---40460273709.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/bofefewimojajowajasule.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca639cb666---97146458479.pdf
    • https://mauspro.net/upload/files/zitugowanifelitetobukupe.pdf
    • https://annjulieskarpmo.com/userfiles/file/18691861635.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4126126af---46488567354.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_off0000ea1a.bin
36c882f25f2b1af3640c6d70722bc53637367e94172eacf8702083d58e71be2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 10404 bytes
font_01_sfnt_off000101ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 16792 bytes
font_02_sfnt_off000119bd.bin
60e2b210d84aaa93bea84c96e4a913d27c8bf09a4c65c0cf02c5243b030d927f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 17296 bytes

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