PDF malware analysis — malicious · 97b6ef0f874db218

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 20:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: c857caf4ce28d04b357833c31e4b1b4b SHA-1: 02b07a1667a98bd980dc665d6e25f285adff0872 SHA-256: 97b6ef0f874db218290315b9c3fd5f48ff512481adbc00b2fbdae7edc64f6c0d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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://crysiq.ru/uplcv?utm_term=ps+in+hp PDF link annotation
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8b72a8ed05f2737bd05f60f3d139d9d3/28410390915.pdfIn PDF document text
- http://red-persimmons.com/upfiles/editor/files/72259114396.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3df2c8570361487b1ff8e8a254d9fb16/tobivajonowolusanurikuk.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e904d490466---63469129763.pdfIn PDF document text
- http://engroupe.ca/aym_image/files/64089573583.pdfIn PDF document text
- https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a588ae57544---nenudexasofifejufika.pdfIn PDF document text
- http://razaviota.ir/basefile/razaviotair/files/mobenadogur.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/l98aa5sstceo0d7193m4odkr96/38263314379.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0c154df98---43004184560.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1913a6a4037d083194dec921140b4086/26601538223.pdfIn PDF document text
- http://poltinka.ru/userfiles/file/korusokujenabapovowisiki.pdfIn PDF document text
- http://atel-j.nl/uploads/files/28290868951.pdfIn PDF document text
- https://angelsforwarriors.org/userfiles/files/10730612283.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eacc1e3b6---72776521454.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba802dd7c1f---zavasodeli.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42944e0e62---81076790033.pdfIn PDF document text
- http://connectcontrol.net/files/userfiles/files/semesekoregunesabotidu.pdfIn PDF document text
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612719c644ef3---nabuta.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c846309f3---5698442358.pdfIn PDF document text
- https://cowichanmusicfestival.com/userfiles/file/90655192042.pdfIn PDF document text
- https://ski-experience-japan.com/images/blog//file/7553482234.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac4e6bc09---9391379909.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74ee13cee---32128159088.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b16dd3a290e---40660728575.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_off0000dc0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC0F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f425.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF425	9692 bytes
SHA-256: `0b2eb4e461b047c05c572efc27dbffe2ec4ec7ae3a8b8cb2d596c85ffdc3a30b`
`font_02_sfnt_off00010901.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10901	18776 bytes
SHA-256: `4c34e55d00bdd293b59239dd1e73b63b77c6f8cfd96762fd518d4664c6054acf`

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