Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1dacf48f2fb0a4…

MALICIOUS

PDF

74.4 KB Created: 2021-09-25 02:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3834be8d4c0565914085ccf75e105489 SHA-1: 7451d98e84bf1dcfd75b4aad5e3ce9b544e05615 SHA-256: 8a1dacf48f2fb0a4f4b53fddac11f0c4db80f75ea78ef61a7f99a7e0cba5effe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161443cfe2568f---57436980606.pdf In PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/sedubobulitadezafevunu.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/gepojugurunalederove.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/laronezobexoge.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/vonujamozajoliwilogev.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/vekub.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/1222084172.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/52485404870.pdfIn PDF document text
    • https://groupits.cm/uploads/fck/file/97094086023.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/tigifivejodat.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/vifatipobagewu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/39422059907.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/82765477570.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e62beb4b92---lijofiranizuvaku.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/79255747896.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/37573113933.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c080d43c2a---58927314216.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/tosutebonokuxalixi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/iqjnsg5ue510psv9bq0pnk6ats/kisumuxerojaf.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/ronikogumatapokiniwerapaj.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/zizoreguxoriwepuf.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/fokipujuxakamob.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/moromabajewulis.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufosidu.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/63988384415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=i+want+to+stop+ads+on+my+phonePDF 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_off0000bc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8D 10568 bytes
SHA-256: 76308b0d09cd3d6b3fa499b6a109bb2c951b6d89ef383194d413bb83896e2297
font_01_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 18280 bytes
SHA-256: 43166f97f2f189fb4b084a81f0afb759ad1b29bbc024573eea86b9a93c33a55d