Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f1fae7e39863a1…

MALICIOUS

PDF

83.1 KB Created: 2021-06-25 21:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d838b8c0130b337d26622aa0e4013f7 SHA-1: e16d1f9ba9f86d32812479aab00cfcaf517e9375 SHA-256: 43f1fae7e39863a1cf0d1173c42304f63d61c6ae578edac6f1c7f6f96b43bb7c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://saluteebenesseresas.it/userfiles/files/51746762415.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a3aaba0a6d894facf719a043e5ab5948/19934806141.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/juxupesirimuwamesakut.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256556a1b3---kakenusomunizabizavetowi.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/liloboto.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/37c51097136d646fc8deff517f5e7e75/jamudaranafemoxujol.pdf
    • http://goldnumber.info/userfiles/file/mawepiwonidejemo.pdf
    • http://guides2alpes.fr/uploads/file/lezologiwaponiz.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825938489f7---zagisudiviwodulaxemuloseg.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kcktuag74q1c09cem1q4aqsmj7/gixuzivuwop.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/19dc8598d938f1143057a35c0185e1a3/87571579005.pdf
    • http://lawrence-spruill.com/clients/42275/File/21585634780.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbfc46df43---54986716359.pdf
    • http://breakevenpoint.pl/uploads/editor/file/66794893963.pdf
    • http://j-club.eu/userfiles/file/55410341126.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d962192636811a2e83942d1e8683a5c4/zolakusofimamebaji.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6e4c77f1---jurukuwubitesomi.pdf
    • http://soles2walk.cz/data/file/42223240456.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e751e5f3943951e71d49016c7dbb4a55/gidovenomowix.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/89468dklpq72dm7r1rnfrtvfm0/29794105458.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+one+sample+t+test
    • 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_off0000e26d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 16792 bytes
font_01_sfnt_off0000fa84.bin
3dec279be6c79cd3251d2873131924074bf191580bbe33c7be78d957d42260ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 10288 bytes
font_02_sfnt_off00011181.bin
5bb30f62cba241a8a5a1d34a6e2171c1d02dded6ea42b15037d8efcdeb07f15d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 17580 bytes