PDF malware analysis — malicious · de42891f387cf303

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 01:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: c6953ae052d74ffdecf9407cb2813786 SHA-1: 875d56b93adc8b397a6febc162635b5b5b7c38df SHA-256: de42891f387cf3036d3a0919de368bab06b65243accfa076142d31592b8a6380

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign context.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://irlanc.ru/uplcv?utm_term=flagyl+for+bacterial+infection PDF link annotation
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0fa2ad54---ziviwawavuwuzutajewi.pdfIn PDF document text
- https://alternativecarrepair.com/userfiles/file/31673585911.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35714d46f1---rimerabisom.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce1caf7a1---vilikifisor.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087697bee65e---kipawo.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609254131108a---70439290258.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084abf59d2c8---wexagofadebikufefavubidet.pdfIn PDF document text
- http://biolabsrl.org/userfiles/files/nofugavelorufenigonax.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729f326f899---494099694.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vm19imevo8dn94d5u6suhesebt/dipojubopozeviwikarus.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/68416470771.pdfIn PDF document text
- https://fruitssupplier.com/app/webroot/img/files/19014668363.pdfIn PDF document text
- http://progfin.pl/userfiles/file/barumedufumisadodezixim.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cc78171e---26935620575.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/dadg8d1d5kdal9dfcp442ig10m/10665482140.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6c517e60329b21d998e82e8b49bbfecc/53817997486.pdfIn PDF document text
- https://peterdegendt.be/file/78427577653.pdfIn PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd449ebc037---2216290373.pdfIn PDF document text
- http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071c102ed7fa---ruriziva.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6b1a1a5018296a99ba4bb024a4144dfa/nobafubujibimuvu.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6020ddaac04dc8e02cf3dc72e44a2b2f/xokibelebiduboroxug.pdfIn PDF document text
- http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/9ekl64qifujt1mhq5vdp21sit4/59250344655.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ae482ed---rajogilarevogikogaruz.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607422348fdab---43123201646.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8gvk056mnle7crq44e8ukt1296/bexevumorapelati.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f724.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF724	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F36	16916 bytes
SHA-256: `87eae1a7778f3dcdd324cb3cd99369c648034f1744e34ef1a2b69fa635aa936f`
`font_02_sfnt_off00013b34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B34	10576 bytes
SHA-256: `c11d83e05b02b30a1b134359796889ef75a01c8dfc4d1385c09e4bccba229b6e`

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