Malicious PDF — malware analysis report

Static analysis result for SHA-256 853756a7b2be25c2…

MALICIOUS

PDF

100.0 KB Created: 2021-06-26 05:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6ddcf78110401e4b7013c7376f9dd82 SHA-1: 55b84c8c1b3378e079974c43912b2824b13d3358 SHA-256: 853756a7b2be25c2b52f40841c0bfe7fb6bec1818131710c2bf8d6c05ccf4703
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is an advance-fee scam lure. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall structure and link farm behavior strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://blankheich.de/images/uploads/file/84143246766.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b231770104---jenajevutuminuvonumubiro.pdf
    • http://springbook.no/files/miwusadu.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f39f1623---25010118643.pdf
    • http://abwingssuffolk1.com/uploads/files/bulileviv.pdf
    • https://nic-irq.com/userfiles/files/vuzeladamewajel.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4b95457f---81176710511.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93884036524.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/sdndie7sjbdpfo7hrpgicsracn/zupadifomuxuxuwajeni.pdf
    • http://eprdel.cz/userfiles/file/7061244925.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0608fb1ab5---26651785783.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d206f27172---36681341661.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2036a6591---wifib.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v6j81g9amth8aar8315cbnh74u/55297825023.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d2afe6509c4ff5e08cb256fd0e7c867e/7998792585.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/uiqbv7uuv4i7leudmprf2b6on0/jaxowol.pdf
    • https://arzhosting.com/calisma2/files/uploads/tabepazizurojolut.pdf
    • http://lifecare4all.com/upload/files/6988810012.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a099a78e034---94049341420.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9lesmm827egjlmqifqn2p9t0m1/jololajefizi.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60142fc08---fesowoju.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12aac26ae7---duwamuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=personnel+evaluation+examples
    • 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_off0001259d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 16792 bytes
font_01_sfnt_off00013daf.bin
c3073405aad13c2a67fa818fd32eda60db8cbe9e0f58f01dd5d227689e860b6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 17056 bytes
font_02_sfnt_off00016a55.bin
d0e888700c7e20e1d0e8b5c66098b27476d19edbf16d5dc00fd9ec8f8f1e4bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A55 10680 bytes