Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44a873357bc811d…

MALICIOUS

PDF

84.3 KB Created: 2021-08-14 05:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd6d4fff6b590835204fe9393b53ddac SHA-1: ff831e31f40f8fe2a12aba90d06f9dd7fad5bca3 SHA-256: d44a873357bc811d30b3bb73f0bb266364269b89f576a4b48af401dbfe13f071
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://aksukartela.com/images_upload/files/39886112646.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/85f3bc424369047b66c70c970b52fe26/zazifurawazufu.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/1988713626.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39452546877.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/42839105962.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d09c4df9ed763f9b67e7648bfa671d90/61951221314.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/jujumepevakabi.pdfIn PDF document text
    • https://landi-bg.com/images/file/tevixunu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092887433357---govesalitesubodoloveluwul.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/lemugafakizudu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/24685957845.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/79543176726.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/42387101597.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2336bc33---savevinupodopoko.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/jodaposilinumomaga.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5soo0jpnk5g8ptaj173krdk2js/zoxekitarimujenusas.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56020cca66---68070423969.pdfIn PDF document text
    • http://topp.pl/_topp/file/28673307447.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607787e16e7ce---60488829321.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d646646122---zozekimubuka.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/64155369656.pdfIn PDF document text
    • https://veljun-ldm.hr/files/mawupifi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da77bd46ce---6387487385.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3erq195iokft7bakch9rth82k4/32229918820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+get+link%27s+shield+in+breath+of+the+wildPDF link annotation
    • https://lapdonline.org/file/wumaterofogujomaterujiko.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_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 11192 bytes
SHA-256: 1c10751fd84657960f8aab4f94830fd1d2516d5a5ccf52a4934f314b7eb0f146
font_02_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 16644 bytes
SHA-256: b076b67c906d8e593c58c2fb3fdc2f09837a6516c396b353ab61811400768d7a

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