Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a4c2fe7c790b83…

MALICIOUS

PDF

94.2 KB Created: 2021-09-20 08:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f862eab5352959653a3d73e0d06adcb SHA-1: 23493a9940786ea2b1f7532a97b39bc56a9d7ea4 SHA-256: 53a4c2fe7c790b83a8e7da28b9dcc029fe86aecd5862c8abdbd8a8ce9c32bcaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=real+car+parking+master+multiplayer+mod+apk PDF link annotation
    • https://tdfstore.it/file/69809404192.pdfIn PDF document text
    • https://podimercrm.com/img/files/vodumijugedopilixes.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/47382641435.pdfIn PDF document text
    • https://la-klamm.org/Files/files/vubisogakuton.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kopigoruf.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/72267394671.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/9635090762.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/bugenelifejopuluto.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/bufuxamupatuwag.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f8a5af8ec8d904864f8389de3438b740/wamixupukasojulewuwike.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29030a369---19483970347.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/5874129061.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/24434022062.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/98888607802.pdfIn PDF document text
    • http://fkhd.cz/data/img/dewarizizexuregorepazi.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/liwonuwadu.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/xakataburigepasojo.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/44121609214.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210908/1443266979.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/44506606280.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c182ce1611---tevonufanuki.pdfIn PDF document text
    • http://talesma.com/E/file/51755047854.pdfIn PDF document text
    • http://seamacros.com/upload/file/67746048309.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa85b6cdbb---53846692172.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/fimagaveteme.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/nujufizut.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 11208 bytes
SHA-256: 7d9c8f3385cb6954d53fa40ad2fde264066756b07a631dd1499e3721a730ddc1
font_01_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 16280 bytes
SHA-256: 6c2373af9f418d6bf213df99f682b881f883cc510106bad74565fdf518858d7f
font_02_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 25184 bytes
SHA-256: 27e20916e376d74124e0692affa746347426f0d1593932dd00419a59c36c7b8d

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