Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dea5ae253e1a315…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 07:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9643bd258ade91e3e94e5dcdae5cf218 SHA-1: 95f55b523c0f54980024b63387aeea55730d2ca3 SHA-256: 3dea5ae253e1a315f525210afe85a8d3ea6beef2dc020af4809b7a8f79ec36f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to host or redirect to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080468421711---begadaxe.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16119ba9fe7abd---zezivude.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/pefawe.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/29817709161.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/puxozutipojuvu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a963fc8be42---supetelexeradudud.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/20400263865.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5000630664---resiriwidekedowasimixawa.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/69622081644.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/28638818883.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/74239720344.pdfIn PDF document text
    • http://zxsolar.com/d/files/63400652135.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210618034932383.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/98854960197.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/pezusezol.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/xitimotozenavefenewixoxit.pdfIn PDF document text
    • http://rjt1.org/upload/files/nukilusajax.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pitidadu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a97c90b80---46586474413.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ac536a90---zoxaxebadow.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec349e99b7---vasesivekogidugaverik.pdfIn PDF document text
    • https://songhong.info/userfiles/file/28226310964.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/lofafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=manual+notebook+positivo+premium+xs3210PDF 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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 18480 bytes
SHA-256: a14fe50f18361a4f045e1acacd80fef0f1eefeea885103e12deb0015a207d1c5
font_02_sfnt_off00013565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 11372 bytes
SHA-256: 263daaf6ad60de75ad107e07c5dec2f0d3502651dbc6c57e40d0d33de23d3ae5

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