Malicious PDF — malware analysis report

Static analysis result for SHA-256 901a7355ac9909c8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 22:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0abe5a021e15cbfa35e9cd14bf5da40a SHA-1: 1846964e713efcff8a752fd9333f590666aa160e SHA-256: 901a7355ac9909c81239ccdb3cf5e6b744dab742a630a90161e7b2008cd92a57
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs and link farms points towards a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=renold+chain+catalogue+pdf PDF link annotation
    • http://psycare-spb.com/userfiles/file/kewajuworir.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/a61e24d18e8f903252909bf7e81fe65d/56242963849.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/rewokapufenugilitogu.pdfIn PDF document text
    • http://malifer.hu/upload/file/xepeximi.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/baligamibimimoni.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612a1db309bcc---kapuraxijub.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/12671696101.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f16bb8ef3---dasuzubirokakoris.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/bomifusamaxabi.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zidusevupa.pdfIn PDF document text
    • http://quinta.cl/upload/files/fivozulimupalu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f93c10ee647---gibetipukof.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/adrok97a35fv37ktcjs71plrqu/nibefuvitavuvof.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/zagusizazojikidagevewe.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/zizazopu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161190783b7192---dujupuwomosuneriwub.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/16711335792.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607257ecd4fad---89146796194.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16100071055842---rodokewibibole.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/15391668041.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e703d04c5---6495265567.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/9646589052.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc22c46f92---luvab.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3786eda88aae58b8df2e1b3177609793/14602793770.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f1941281d---xilovivesod.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/fefiwes.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.

FilenameKindSourceSize
font_00_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 10776 bytes
SHA-256: 48a1afe9cf8e818a0b059f3c06550019868a698ab572abcbcae58eaf7d32bf90
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 17032 bytes
SHA-256: 465505004201fefa6ca55f3ee01169143f6145ff392d541cfb9234f1c28d179a
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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