Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ccbbfa2bb5bc7fe…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 08:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3440d443805a6300a798101176d8b38 SHA-1: 424227d0b8c2fcb04c800e9d0d80fd2cdb4ad31e SHA-256: 0ccbbfa2bb5bc7fec213ef9b2170fd4acb38de8d565ca1ad95b550c755b2152e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used to distribute malicious content or phish users. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aquamedia.cn/ckfinder/userfiles/files/dadajivasilabora.pdf In PDF document text
    • https://ceral.pl/ceral/pliki/file/95748655795.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/14399442567.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/ratebirogopibuv.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lapovigotivobipeji.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/rabugevaralam.pdfIn PDF document text
    • http://learningkey.org/userfiles/bugedo.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210910171956.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/soziwi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc28289a0b---mimubijaxifegetuketoduxas.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/mudob.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/30649543455.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/30858217545.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/amutnqb8nj61c9usq398il11q1/96204602364.pdfIn PDF document text
    • http://jainfarms.com/uploads/tunalusari.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80d17ebd---megomugovoju.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/puzaroxelafekofug.pdfIn PDF document text
    • https://seger.cz/userfiles/file/wopik.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/24483801976.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a3fb30b1e---rogibizasegalagetazax.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/ketapadav.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/bewefijudiweto.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/75822896399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=3d+parallax+background+apk+full+2020PDF 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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 11056 bytes
SHA-256: 7def80a083d655758a109e4d1f154d348d148cb1c6c20b856fa889898ca56ab7
font_01_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 21448 bytes
SHA-256: 25094f5484688784ec94ce9780e40c7fdeb38de8987c5d86c0bed1dbc663d557

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