Malicious PDF — malware analysis report

Static analysis result for SHA-256 707d037e616b40ae…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 05:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba77ae9d84c5edea1aea46773979889e SHA-1: fb6bfe51a9670a9c93eed8fcf792fac5b4e25b9c SHA-256: 707d037e616b40aecf5aa8d578d4a26b210e1b954943bf2c5aaae22e8c8fc98b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to host these malicious links.

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://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/29151855194.pdf In PDF document text
    • http://ok-poland.com/userfiles/file/duteziju.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/tujabekatonibopibani.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/guwonadavurotidipabobe.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/37395428975.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/64246950103.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ibckfmssr3hsd3dd7tkt7468f1/kilubarabi.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/84163353345.pdfIn PDF document text
    • https://anaksemut.com/contents/files/wafawujuru.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/dogerujazosepijomukij.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/sogamedinovinagomutodu.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/62894520987.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6d10bd20---25296821162.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/35202836287.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c2ab2cc8---volebexa.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/wapobew.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/bazikofusazeko.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/24090898169.pdfIn PDF document text
    • https://ptogel1.com/contents/files/86653554150.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/81990148795.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/65883271384.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/75970755761.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/xalawum.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/33168911874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=youtube+mate+downloader+for+androidPDF 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_off0000af2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2F 10656 bytes
SHA-256: 8d25f576aa36608b2d4c22ec760a315fa81d8b84ebfbe2bb99b402ffae406be0
font_01_sfnt_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 16092 bytes
SHA-256: 32081ba8c750916a5eb19ab07130fd279fabc3485524161e7fa5e63406d9ae10
font_02_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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