Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d70ecfd5cf3cf3b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 17:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 070cf0fa01529fc543f05d707991485e SHA-1: 33408509d5444de8b9a4282100cee67048691810 SHA-256: 8d70ecfd5cf3cf3ba072a83b98dd49e17ff9d87556f7b21bdced3bd3611b46cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://migger.dk/userimages/file/mitotamimemosegemim.pdf In PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/rowajowowezosoliximutuvut.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091596b0651c---33588023419.pdfIn PDF document text
    • http://atek-ent.com/upload/file/97295450661.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/0dc878a2085e8a71f7b49cc6d3c78260/48710093245.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c1778503---45511622730.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/94089546927.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/vozozepujot.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c678c51ef---nitorikisusevudowurikum.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2b901ac0d---tuzeximenil.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/lagerizasirepajuliveru.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1205ab88---boniwesafomuf.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/femed.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/7273669428.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/1959155263.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/mirijifamebefarufotapewo.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/40043928876.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/5408951552.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/lekiwikexamiziw.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/wepuwan.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/kuxokepu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/f2827f0qtl4uo2v4i2rh2cm69r/12763761236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=decoracion+de+navidad+manualidades+para+ni%C3%B1osPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 10952 bytes
SHA-256: 84a6f8d3d618d0df1409dc7f512d43be8f78243e21c3e4c3ee70e36e87cc564d
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 18284 bytes
SHA-256: b7bb8d2a085bac4c553c001a2ca58a90ba6940f927408f3960a526ac8cc0b5f1
font_02_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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