Malicious PDF — malware analysis report

Static analysis result for SHA-256 0153d74c2ef30a59…

MALICIOUS

PDF

108.1 KB Created: 2021-06-29 18:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 27ed417dfd62ec185ac6a056af3d299d SHA-1: 5bbe62bb1edb5b5f171c920e431b2f1cef6f0ac2 SHA-256: 0153d74c2ef30a594907f2885dfbc42897a40c2c7148b03917ad0aa643747ee2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of multiple external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/s5enrfidpa01a9nl4dn2rs01b4/66447861887.pdf In PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f39c2b74993d797003f2bdeda1294b9e/dukokujuvi.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/zotuzinizegoxijuve.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c93d705d7---jagujakuninap.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b2e853269d6ecc79b3db90d8ab4e1048/gaminajefutexedo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e2524675---kutesoxunigelok.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/416400bc399f525f622142f97e2c23ab/tuxudadu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/023b4f6e6edea1beffd2dceffb0e46d7/44257581269.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/lozitaxeronoxa.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/60264091363.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/3925783902.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fffcb7664b2091cc3e58c2db35479afa/68882379236.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/285ddf794446f440e0e76db6fad4f98c/45408824792.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/1801516725.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ad576c3b---nuvemubumadukonaw.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/oopi8rs1tkmqb03tjmceb09co9/ridedilerojune.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0po6cpm2d4n9lj6n6k7h6e2kj0/vavuxavodekime.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77b72f41a---jodesuzewidunevibukipez.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0d1e6026---68542437734.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762d5949a04---94400210555.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/zuzojejoje.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/funexot.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/funonewizazefabowajoza.pdfIn PDF document text
    • https://marosme.ro/hirek/file/zakibebeditowatunefata.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53b977aaa---sixefafutemi.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11ac04ea4---23943792738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=interesting+facts+about+brahmaputra+riverPDF 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_off00013ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE6 11140 bytes
SHA-256: 6aa78c884df786e3b60cdc89bc15e67119acba7e94ac2f3802821a340e15a285
font_01_sfnt_off00015697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15697 20648 bytes
SHA-256: 3334d67037c5037f941f25c2af08f61e243be0fb8f2ebf1fd1f2c3280ef2913e
font_02_sfnt_off00018ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1