PDF malware analysis — malicious · 70820f1be67753c2

MALICIOUS

PDF

88.9 KB Created: 2021-07-07 15:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 41a579c5653d8050c3ca2e4728d70cf8 SHA-1: 3e9e82292003afc2fef6a8157aeb3068ca9e8606 SHA-256: 70820f1be67753c245437206615795eb1a9ac9c62881fcf2aa20e6e76ac0448c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c896cecf66---fodidek.pdf In PDF document text
- http://ecohost.ru/pics/images/file/75597900200.pdfIn PDF document text
- http://ongnuocdenhat.com/upload/files/waniburorujuwo.pdfIn PDF document text
- https://toptenstudy.com/upload/files/BodyFile__60D5BFECBD135.pdfIn PDF document text
- http://akinmedikal.com/uploads/file/99161814937.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0db212964---xurozafebomimegoxisejug.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4d3a5e2b54a03905250d5f6291a09997/21159283991.pdfIn PDF document text
- http://scriptonica.ru/files/files/siwevovatifemo.pdfIn PDF document text
- http://vds-construct.pl/userfiles/file/luzug.pdfIn PDF document text
- http://auburn-companies.com/userfiles/files/21569874398.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3ue1skkb8aatporqkf647ca3av/desurokowifa.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a77d768e---nuzuleruvef.pdfIn PDF document text
- https://aedwea.com/upload/foto/biropogidanegaxi.pdfIn PDF document text
- https://argentinaproduct.com/ckfinder/userfiles/files/42038304378.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8e4030e588f769456165261f6e798e5d/31156691202.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/6mie4mg8vu2iafrg84e84fnfsl/52185663505.pdfIn PDF document text
- https://fenixfalt.com/userfiles/file/83090576002.pdfIn PDF document text
- http://delshadian.com/public/userfiles/file/5470264240.pdfIn PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6lc46i2kflgpto7sdt1aqeir6v/vetobubokagub.pdfIn PDF document text
- https://blugarden.eu/file/pilis.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1774e9e564---71777344579.pdfIn PDF document text
- https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e8da65f0e8335d463b1f1e5318e55db2/lisafepujeramapedetapex.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f74ad031140b259d9db5335316f17f8b/tujel.pdfIn PDF document text
- http://polipack.ru/content/file/82752895235.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q8cv8g74q0gfnlu2g6lvl0mta2/jovuzikutixutinosapuwot.pdfIn PDF document text
- https://flyags.com/editorResources/file///28881466676.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+printable+phonics+assessmentsPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f2fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2FD	18732 bytes
SHA-256: `d7d4015b66911af2fcd43b87a5e2639c84b24f5406fb9fff64a3290e6f83c92b`
`font_01_sfnt_off00012405.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12405	10756 bytes
SHA-256: `9dc0219e6896ed1ed3adb35f4d5887189b103359f19290b08439200d53e1639a`
`font_02_sfnt_off00013c4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C4B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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