Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a2fd2acb2ee5e6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 03:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a4492f89634ceb2f2cf6308f77d8627 SHA-1: 867b6142cb4d4eec10b3b46185cfe7ba95158ce3 SHA-256: 88a2fd2acb2ee5e687943d0ebcfebc8bd99b4521ca2e06ac6a23568860ec76ba
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=bangali+babu+english+mem+full+movie+download PDF link annotation
    • http://grandrosso.com/js/upload/files/rufiwuwupesume.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/22311098674.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/8199503118.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/77256916139.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/3498082500.pdfIn PDF document text
    • http://hmed.vn/upload/files/65521605527.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/51058725282.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/bugexenexege.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/22115618500.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/12094184851.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2fe0e59fedc1433e5e71d5798bcf295/59621757229.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/wegizivexido.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/lenafebonap.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/tafefuzanukixixelogiberir.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/96803564937.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/zujadusalozowumigoso.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/7088611107.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8af570ab5---44880569526.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/tujuvewid.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10138371690.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/572a36d8fa8fb152c08eb3e2782f93cc/71474923593.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///51292100549.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/xivalibisuxojavorozesade.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139d204a5841---tupiwug.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/soroxowikiwiwa.pdfIn PDF document text
    • 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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 11048 bytes
SHA-256: 3d033783dadef6ba24b74c0f1700dffdd6f69965b333aba0999431c9353a2491
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 19476 bytes
SHA-256: ff1bacf40e19347bc057cbfe1883e720cc9045acb0ae345830849c6fcaa890f5