PDF malware analysis — malicious · b9043183ce1a3929

MALICIOUS

PDF

83.0 KB Created: 2021-07-09 07:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 1066573651c36605f84583bcd4126a65 SHA-1: f34e28b6b0d7e5b6835c7aab7081409ea0333c8a SHA-256: b9043183ce1a3929856b615e2d8b82cf42886e4bd7348bc0a781e20dedb7dbb6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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 https://allytemp.ru/uplcv?utm_term=nordic+body+map+questionnaire+pdf PDF link annotation
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/af145b8898838ac3e7f13189530c59ab/gifefidogetufinakanej.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160750d774bb1a---7241596507.pdfIn PDF document text
- http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/lonizatovupoxifurejat.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fc12be73a6760e1012bb4850e5f21306/davepagiroketubibufusaf.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5cd5431ae---48714823439.pdfIn PDF document text
- http://sskj.pl/userfiles/file/tuwuvomaxevurage.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/faffe03c3d8b73db83a48f1763dfbbcf/92418977584.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366bf1b43a---xisemonilodapigizi.pdfIn PDF document text
- http://fogathajtohirek.hu/fckfiles/file/vuzilo.pdfIn PDF document text
- https://sukhayurveda.in/userfiles/file/gusemanuxenawezupewafof.pdfIn PDF document text
- http://rosniyom.com/userfiles/files/wopebosemeru.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9915064f---31402509732.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a4d915f9---95776688734.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/feb2a0c8e9d135e4c3e70e6a1f43dfbe/xovefimajimepanuxad.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90136ea572---devomodowe.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb053100c0---letidozujoluka.pdfIn PDF document text
- https://dbjadow.pl/attachments/file/muvixajozofoxole.pdfIn PDF document text
- http://aire-limpio.com/img/editor/file/57350333084.pdfIn PDF document text
- http://01host.ru/userfiles/files/selurexapuroxowapat.pdfIn PDF document text
- https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/926a13b7b6639325f66e02f47807b0e7/bomifapolofexinulowevel.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018cf8add6---80290858602.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/xagaz.pdfIn PDF document text
- http://bjhtdszdh.com/v15/Upload/file/20216251313267889.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608839b79ded9---24731199473.pdfIn PDF document text
- http://doi.org/10.37506/ijfmt.v15i3.15969In 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_off0000de52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE52	11212 bytes
SHA-256: `13181d569a8de6bac5ceb0ab701e0c39cde21b69df76b9b4d19b5d27c097a1f6`
`font_01_sfnt_off0000f837.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF837	17636 bytes
SHA-256: `ac4002a4c48a842435a7d25b10827b994f0b42c87ab75f60eeac52146f8f70a0`
`font_02_sfnt_off00012690.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12690	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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