Malicious PDF — malware analysis report

Static analysis result for SHA-256 accd97c96ef22c6f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 13:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3588426cd7fa1b5449dc2c8dd69f8721 SHA-1: 803b4d619175303f05c89a97f285238e999039a2 SHA-256: accd97c96ef22c6f8f1f7d4cb8639578ea9210b778291f63471f8e731fffb4b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6197

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://krisoc.ru/uplcv?utm_term=industrial+pollution+notes+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06cbcb27fd---23772492986.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/90158933266.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/fimojil.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e09ea93a2---gamanoroji.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/13144903212.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/38149295632.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/25860448196.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b0098fa3---75811718736.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b2ee2542e92aaeaf840b3f14eac82b3/58238502684.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/wufejasofazekekutosako.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/nujazukuvalepepeporakipu.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/52999452257.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/musibid.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210704154521795.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/73831326680.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/55736610004.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/rolotewix.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/07d2abbbeff4f696266699c655d79d62/rixijutesukasusipapikiv.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16125cadd7382e---wivosisafigiw.pdfIn PDF document text
    • https://izr.fr/files/davezaneloloximamoxa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcdd5dd6a1e---tolumagofigeb.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d395cbf2fbce2cebcd8fdd75e2376bf7/darufaputu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f0teujjsgo3f48h6qmkikeigps/59280502303.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf16c6b598---34116733730.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0219303418---72034897465.pdfIn 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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 16372 bytes
SHA-256: b73894a36c9897b3a2ca4a34fbfd166fa8ded40aa5862316ef411d458fe38266
font_02_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 10544 bytes
SHA-256: a5f011657b9b06d11da4af6872fb192ce07f152eb101a03c5fadc2798375aef5

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