Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6abf2dc16cb65b…

MALICIOUS

PDF

106.3 KB Created: 2021-07-05 18:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f79047a5680bddf9ec51e76966333e69 SHA-1: bd8b2632ff400651144bc1bfbad8b00ed7e573ef SHA-256: 9b6abf2dc16cb65b8c51ee522f6b3ed87e0031d917fd2bddf5eead4fd6cc8617
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS upload storage or disposable hosting. This structure strongly suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://debandhelder.nl/ckfinder/userfiles/files/75173330523.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ueh7s3haf3tdtofv6n7n9me9c4/69314659163.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c4175a4026ab2ed55fd05e6ea66b596e/gikozato.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17192b04e---gagigasisalame.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/n9iolqk7ke86d1bc3hrc1fgaco/kipewonutisogotilo.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e6e1b91f---72905788217.pdf
    • http://chinasoftcore.com/userfiles/file///julorazif.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/93a982975bf65beb553c69db0fd36010/77518260551.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094694d7ed4e---60113473122.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7014c83b86605a7c72f3560e0d772f51/49980055968.pdf
    • http://mesterek.net/tmp/guzozawa.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c153d6472---mufuvusanekupok.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/c00uft50sifltg61qt3t4idkni/davuli.pdf
    • https://turkuazhost.com/calisma2/files/uploads/52045342977.pdf
    • http://mywymc.com/userfiles/file/megubokitaxikuduziseletom.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7a432f851---malazovawijesudeg.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/muhs71m2hiqkrb2mmgsi6cd9b2/41934239268.pdf
    • http://skomi.ru/img/files/file/99416086886.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t3fvai43fmm42do15ejgfs3smi/gofipusokenavexomuzax.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d2d4e4a69aa3af182b1da979d42ce386/fizesetipaxoxanexufatix.pdf
    • http://changju-hotel.com/CKEdit/upload/files/sazorexovajeragad.pdf
    • http://nappsa.org/userfiles/file/wajuzeroxiwuxi.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/273527fd11a691609383271297b40d37/58538313364.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7f757c66---zudoj.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5781a2ac---tadetotizadagapopajixa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=antigravity+muscles+of+upper+limb+and+lower+limb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B19 16792 bytes
font_01_sfnt_off00015330.bin
ae3fe9c6eb0c977a727b3170c2a8b9d2c208268af205b95a686a3502fb768966
pdf-font-stream PDF embedded font (sfnt) at offset 0x15330 11448 bytes
font_02_sfnt_off00016dea.bin
9d498448abf7ad0f04297c957a653b4670119c034d21510f6dc501a6b08e1f15
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DEA 17648 bytes