Malicious PDF — malware analysis report

Static analysis result for SHA-256 4277add31bafdec5…

MALICIOUS

PDF

67.7 KB Created: 2021-09-16 23:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4e6cb1600955532975b72b7cd06e56c SHA-1: 26d5d344bd12e5a051bb21df3c4bd22644be8125 SHA-256: 4277add31bafdec59fffee846ccc23e3ab3850f7f7cd63c564fc7c6fdfdd38a0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking an embedded link. Multiple heuristics indicate it's part of a link farm hosted on compromised WordPress sites and disposable domains, aiming to obscure the ultimate destination. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=sims+3+cheats+apk', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=sims+3+cheats+apk
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135405d42ea4---21812441630.pdf
    • http://lmleadmanagement.com/userfiles/files/74153619540.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/lukese.pdf
    • http://cpk.by/ckfinder/userfiles/files/32798751540.pdf
    • https://luminex.pl/upload/file/jasizilemuw.pdf
    • http://konberdbio.com/upload/files/majofela.pdf
    • http://seksdagen.nl/userfiles/file/79879811642.pdf
    • http://vdavloeren.be/userfiles/files/82626026592.pdf
    • http://marasintl.com/public/ckfinderuploads/files/kimovu.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/927797f7ccd601156d1510beb913cfbe/56517537831.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/39778206068.pdf
    • http://mgtofubbq.com/uploads/files/minub.pdf
    • http://chinalabware.ru/d/files/nerikoxomisakejusew.pdf
    • https://fetogram.com/images/upload/files/25061399409.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6e4423e4931ed9c5d07c0ca6bda7f99e/guweduwuveto.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50527aac1---kakofuja.pdf
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/dazakalowipomulirid.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404b3f82414---noxabefugane.pdf
    • https://laserbeautymachine.net/d/files/31021473260.pdf
    • http://kassa.pl/userfiles/file/26066249030.pdf
    • https://ywint.com/ckfinder/userfiles/files/1631727769.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/bowek.pdf
    • https://suma.ca/upload/editor/file/litijapeviw.pdf
    • http://ping-property.com/user_img/files/62873742817.pdf
    • 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_off0000aeab.bin
6d24fbdeac0678d561aecbdb62c14872fe70879a1ebf0343b96f73b9f493a3c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAB 14036 bytes
font_01_sfnt_off0000d129.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD129 16792 bytes
font_02_sfnt_off0000e940.bin
56aebb49d1dce83f489abb86579cd5ac2f543d7316cb3116087809694947d10c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 10608 bytes