Malicious PDF — malware analysis report

Static analysis result for SHA-256 173e62a587a8ef82…

MALICIOUS

PDF

90.8 KB Created: 2021-08-08 13:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8b5e0eb9b9b7ffe20ff10cbebd8132b SHA-1: b9e74f98ef157b5a75005726988e0a44dd776099 SHA-256: 173e62a587a8ef82c750bd8c5a1a266b8893ee12ad3d9dd62f577907a6b727ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ggmtc.net/userfiles/files/dobulafivulapipukejuxetu.pdf In PDF document text
    • http://comp-art.ru/userfiles/file/89518036194.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ic987mr6gnopebdv71orl3n55p/97700200235.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/katiwupabuzipadoredon.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/5357893026.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b0bd4f636---25656162549.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eea4703c2---78200567558.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c656b85d948---xudapotufunegometek.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/bepipefatisa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609488ff71baa---vubow.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/60090756850.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/gofepuwurinabobig.pdfIn PDF document text
    • http://apsons.eu/files/file/38418731996.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/zagijizabofumizuseb.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cb3c0851df29a87bf4a3d00d673df5be/lepokaduvunepukox.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/80459021329.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab2089c11---sovokobozag.pdfIn PDF document text
    • https://t2sc.me/userfiles/pajivozatokeborasisad.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4bdd492b7---jodekoxulisusi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cf633b18e9556788c661ebe09a132785/jilodazonerurekunomiler.pdfIn PDF document text
    • http://merwepizza.com/upload/file/57092979277.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608053fc7c4d3---86733864284.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/42981989095.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/81644175532.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/3va171kbpeng5nbstc1lff95m2/8809878304.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36470ba3d---84635121856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apk+unlock+skin+mobile+legendPDF 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_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 18088 bytes
SHA-256: f81b78583dd5f971fe2de4605aa7cb9ec3eceb8c89b8a97f7a3cc916958c2e9b
font_01_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 10808 bytes
SHA-256: b11c798be097e3bb912f8d8128ff13cc519a4644e1aaa5b5d7fc01e3346fa1c8
font_02_sfnt_off000144cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1