Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f925f38fa150a15…

MALICIOUS

PDF

113.5 KB Created: 2021-07-19 03:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2b058dc14d0ca1fb639be194fb4771c SHA-1: 1372698bcabbdbb175bb371048c5f78ad91e2250 SHA-256: 0f925f38fa150a15022ddf724639618eb3fa7c43f70eb3c97b83f3ad7d0a5699
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories, likely to host and distribute further malicious content. The presence of a 'download button' lure reinforces the phishing or social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/35202389118cb2d640ee0b111a37d386/24583913875.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e3a79834---zulojotususosex.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d2726097---91609478730.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/kofabosagul.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/kotapobipejejuber.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/72934604541.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2c3e57c0ae5b19e49a6194afa8253b7d/54302036323.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/44576658228.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/92857254409.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/3147426225.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fovomokaponi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c0eadab57---50386400636.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6caiu7hudc4vc14b08pvnldteh/83437408670.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/lokesapix.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/2976845200.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xumorotetukogutikanerabux.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2d30def514048f3639f71943222a1c29/pelibokegafelab.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/22298640501.pdfIn PDF document text
    • http://3sdent.com/upload/files/97140976958.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edc2886c7---72904367748.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee586a350---bibumexerugerikewewedag.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1ad2cecd758f721f66032c4e506dc0f1/44409634545.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1b76399d52cb8af576a4fd913a0a5013/62651066127.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c476fa11a0b6cc8fba9217cf060ec95a/5742837818.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/67062216822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=an+astrologer%27s+day+summary+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB6 17976 bytes
SHA-256: ad192176e0a2bd4a4f373113a0f5dd06aa433e0e22249d6432a277b8310279b8
font_01_sfnt_off00016e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000186af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186AF 11064 bytes
SHA-256: b12cbb0f237b0787b5bc70d2e9db9cf7989292e4ff039f87dc10cc5b5e1e8629
font_03_sfnt_off0001a06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A06D 16240 bytes
SHA-256: fad5dacf09cd1b43314537240f9f06457f0671f261c0d1ec505bc4c7454e8b9a